Equations were fitted to learning data obtained on the Number Facility (NF) subtest of the Repetitive Psychometric Measures. Ss were divided into three groups to increase the correlation between their individual scores and the resulting equations. The equations were derived from the pooled scores of two samples. The theoretical performance of Ss based on a logarthmic function was then compared with the actual performance of a third sample. The amount of variability accounted for by the equations ranged from 53 to 86%.
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